import json

from pydantic import BaseModel, Field, field_validator, model_validator


class CreateGenerationTaskRequest(BaseModel):
    """创建生成任务请求。

    支持两种模式（至少提供一种）：
    - 项目模式：project_id + asset_library_id（向后兼容）
    - 模板模式：template_id + asset_ids / title_ids / voice_ids
    """

    project_id: str = ""
    asset_library_id: str = ""
    strategy_id: str = ""
    voice_library_id: str = ""
    created_by_user_id: str = ""
    # ── 模板模式新增字段 ──
    template_id: str = ""
    asset_ids: list[str] = Field(default_factory=list)
    title_ids: list[str] = Field(default_factory=list)
    voice_ids: list[str] = Field(default_factory=list)
    # ── 来源剪辑计划 ──
    source_edit_plan_id: str = ""
    # ── 视频标题 ──
    video_title: str = Field(default="", description="生成视频的标题/名称，为空则使用默认命名")
    # ── 批量生成 ──
    count: int = Field(default=1, ge=1, le=50, description="批量生成数量，默认1，最大50")
    # ── 素材库自动匹配 ──
    asset_select_mode: str = Field(
        default="all",
        description="素材选取模式：all=全部ready视频, random=随机选取, smart=智能匹配（按质量/时长评分）",
    )
    asset_select_count: int = Field(
        default=0, ge=0, le=100, description="选取数量，0表示全部（仅 random/smart 模式有效）"
    )
    # ── 自动重试 ──
    auto_retry_enabled: bool = Field(
        default=False,
        description="是否开启失败自动重试，默认关闭",
    )
    auto_retry_max: int = Field(
        default=0,
        ge=0,
        le=5,
        description="最大自动重试次数，0表示不自动重试，最大5次",
    )

    @model_validator(mode="after")
    def _check_at_least_one_mode(self) -> "CreateGenerationTaskRequest":
        has_project = bool(self.project_id.strip())
        has_template = bool(self.template_id.strip())
        if not has_project and not has_template:
            raise ValueError("project_id 或 template_id 至少需要提供一个")
        has_library = bool(self.asset_library_id.strip())
        has_assets = bool(self.asset_ids or self.title_ids or self.voice_ids)
        if not has_library and not has_assets:
            raise ValueError("asset_library_id 或 asset_ids/title_ids/voice_ids 至少需要提供一个")
        return self


class GenerationTaskResponse(BaseModel):
    id: str
    project_id: str
    asset_library_id: str
    strategy_id: str
    voice_library_id: str
    template_id: str = ""
    asset_ids: list[str] = Field(default_factory=list)
    title_ids: list[str] = Field(default_factory=list)
    voice_ids: list[str] = Field(default_factory=list)
    source_edit_plan_id: str = ""
    asset_select_mode: str = ""
    batch_id: str = ""
    video_title: str = ""
    status: str
    progress: float
    result_count: int
    error_message: str
    error_info: dict = Field(default_factory=dict)
    retry_count: int = 0
    auto_retry_enabled: bool = False
    auto_retry_max: int = 0
    logs: list[dict] = Field(default_factory=list)

    @field_validator("logs", mode="before")
    @classmethod
    def _parse_logs(cls, v: object) -> list[dict]:
        """将 JSON 字符串解析为 list[dict]。"""
        if isinstance(v, str):
            try:
                parsed = json.loads(v)
                return parsed if isinstance(parsed, list) else []
            except (json.JSONDecodeError, TypeError):
                return []
        if isinstance(v, list):
            return v
        return []


class BatchGenerationTaskResponse(BaseModel):
    """批量生成任务响应。"""

    items: list[GenerationTaskResponse]
    total: int


class ListGenerationTasksResponse(BaseModel):
    """用户级生成任务列表响应（跨 project）。"""

    items: list[GenerationTaskResponse]